// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use rand_core::{CryptoRng, RngCore};

/// Random number generator.
///
/// Reuses the common API from `RngCore`. Implementing the marker trait `CryptoRng` asserts that
/// your random output is usable for sensitive key material.
pub trait Rng: CryptoRng + RngCore {
    /// Provides a random byte array.
    ///
    /// This is a convenience function, as CTAP often requires such keys or tokens.
    fn gen_uniform_u8x32(&mut self) -> [u8; 32] {
        let mut bytes = [0; 32];
        self.fill_bytes(&mut bytes);
        bytes
    }
}
